E3 Loopbacks - 3Com 3C63100-AC-C - PathBuilder S600 Bridge/router Reference Manual

Figure 150 DS3 UNI Loopback Options
Network Side
Network

E3 Loopbacks

The E3 module supports the following loopbacks:
Local Card—Loops the transmit E3output on the receive side. All cells coming
from the E3 port card are looped through the backplane and back to the E3 port
card. The transmitted data will continue to go on the output.
Network Line—Loops the E3 received data back on the output side after the
digital data has been recovered.
Network Card—Loops the E3 received cell payload back toward the line output.
Figure 151 illustrates the loopbacks for the E3 module.
Figure 151 E3 Loopback Options
Network Side
DS3 Interface
Network Card
Line
Network Card
Line
Bus Side
Local Card
E3 Interface
Local
Payload
Using Loopbacks 197